one trick i like to do is ghost images. You just lock the camera down on a tripod, open the shutter for one minute, and for 20-30 seconds have someone stand in the picture. Because for the other 30 seconds the background was exposed, you'll be able to see right through the person. Vary the times to get more solid or vaporous ghosts.
You can even achieve the ghostbusters effect (normal lookin' head on a vaporous body) by taking a spotlight/flashlight and shining it on the face for a bit - it'll expose that area more than the rest.
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